Divisibility Rules

1
Divisibility Rules

• 2, 3, 4, 5, 6, 9, 10

2
Divisible BYWhat does it mean?
3

• Divisible by means
• If you divide one number by another, the result
  is a whole number WITHOUT a remainder.
• Examples
• 12 6 2 No remainder
• 15 5 3 No remainder

4
Divisibility Rule 2

• A number is divisible by 2 if the last digit is
  even. (0, 2, 4, 6, 8)
• Examples 78 3470
• Review Even numbers ghosteven

5
Now You Try

• Which number IS NOT divisible by 2?
• 572 1464 249

Need More Practice Numbers Divisible by 2
6
WONDERFUL
7
It ends in a 0, 2, 4, 6, or 8.
8
Divisibility Rule 3

• A number is divisible by three if the sum of the
  digits is divisible by 3.
• Examples
• 75 7 5 12 12 3 4 No Remainder
• 369 3 6 9 18 18 3 6 No Remainder

9
Now You Try

• Which number IS NOT divisible by 3?
• 572 1464 279

Need More Practice Numbers Divisible by 3
10
The sum is divisible by 3.
11
WONDERFUL
12
Divisibility Rule 4

• A number is divisible by 4 if the last two digits
  are divisible by 4.
• Examples
• 1320 20 4 5
• 672 72 4 18

13
Now You Try

• Which number IS NOT divisible by 4?
• 564 4101 188

Need More Practice Numbers Divisible by 4
14
WONDERFUL
15
The last 2 digits are divisible by 4.
16
Divisibility Rule 5

• A number is divisible by 5 if the last digit is a
  0 or 5.
• Examples
• 615 ends in a 5
• 1480 ends on a 0

17
Now You Try

• Which number IS NOT divisible by 5?
• 9820 779 560

Need More Practice Numbers Divisible by 5
18
The number ends in a zero or a five.
19
Wonderful
20
Divisibility Rule 6

• A number is divisible by 6 when it is divisible
  by 2 AND 3. (prime numbers)
• Examples
• 408 ends in an even number (2 rule)
• sum of the digits is divisible by 3
• Review prime and composite numbers Prime and
  Composite Numbers

21
Now You Try

• Which number IS NOT divisible by 6?
• 8700 523 7602
• Need more practice? Numbers Divisible by 6

22
Way To Go!!
23
This number is divisible by 2 and 3.
24
Divisibility Rule 9

• A number is divisible by 9 if the sum of the
  digits is divisible by 9.
• Examples
• 963 9 6 3 18 18 9 2
• 5445 5 4 4 5 18 18 9 2

25
Now You Try

• Find the number that IS NOT divisible by 9.
• 9873 636 5541
• Need More Practice Numbers Divisible by 9 and 10

26
The sum of the digits is divisible by 9.
27
Great Job!!!
28
Divisibility Rule 10

• A number is divisible by 10 is it ends in a ZERO.
• Example
• 7630 ends in a zero
• 410 ends in a zero

29
Now You Try

• Find the number that IS NOT divisible by ten.
• 56,920 7537 870

30
The number ends in a ZERO.
31
Way To Go!!
32
Congratulations!

• Complete two of the three assignments. You may
  complete them on your computers but print out
  your answer sheet.
• Assignment 1.doc
• chart.doc
• assignment3.doc

33
Now that you have completed your two assignments,
feel free to go to the following sites. THEY
ARE SOOOOO MUCH FUN!!!!!!Fractionsvectorkids
-divisibility rulesGamequarium Division Games